Russula olivacea is an edible and non-poisonous Russula mushroom found mostly in groups from June in deciduous and coniferous forests, mainly under spruce and beech; not rare.
The cap is convex when young, soon flat, yellowish-olive when young which develops into rusty brown; it ranges from NaNcm (-2,147,483,648inches) in diameter.[1] The gills are cream, deep ochre when old and rather crowded and brittle. The spores are yellow. The stem is strong and evenly thick, often pale pink; it ranges from long and wide.The flesh is firm, white, with a pleasant or innocuous scent, and has a mild or nutty taste. Some say it is edible[2] and other say it is toxic,[3] perhaps causing gastrointestinal upset.
Russula viscida is in size and habitat very similar; the surface of its cap is bright purple to blood red and shiny. The base turns leather yellow when old. Its flesh is quite pungent.